<template>
  <div>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <el-alert
        title="注意:只允许为第三级分类设置相关参数"
        type="warning"
        show-icon
        :closable="false"
      >
      </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader
            props.expandTrigger="hover"
            v-model="selectedCatKeys"
            :options="cateList"
            :props="cateProps"
            @change="handleChange"
          ></el-cascader>
        </el-col>
      </el-row>
      <!-- tabs页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数的按钮 -->
          <el-button
            type="primary"
            size="mini"
            :disabled="isBtnDisabled"
            @click="addDialogVisible = true"
            >添加参数</el-button
          >
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" style="width: 100%" border stripe>
            <!-- 展开行  -->
            <el-table-column type="expand">
              <!-- 循环渲染tag标签 -->
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="参数名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  icon="el-icon-edit"
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  icon="el-icon-delete"
                  type="danger"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加属性的按钮 -->
          <el-button
            type="primary"
            size="mini"
            @click="addDialogVisible = true"
            :disabled="isBtnDisabled"
            >添加属性</el-button
          >
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" style="width: 100%" border stripe>
            <!-- 展开行  -->
              <!-- 展开行  -->
            <el-table-column type="expand">
              <!-- 循环渲染tag标签 -->
              <template slot-scope="scope">
                <el-tag
                  v-for="(item, i) in scope.row.attr_vals"
                  :key="i"
                  closable
                  @close="handleClose(i, scope.row)"
                  >{{ item }}</el-tag
                >
                <!-- 输入的文本框 -->
                <el-input
                  class="input-new-tag"
                  v-if="scope.row.inputVisible"
                  v-model="scope.row.inputValue"
                  ref="saveTagInput"
                  size="small"
                  @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button
                  v-else
                  class="button-new-tag"
                  size="small"
                  @click="showInput(scope.row)"
                  >+ New Tag</el-button
                >
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column prop="attr_name" label="属性名称">
            </el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button
                  size="mini"
                  type="primary"
                  @click="showEditDialog(scope.row.attr_id)"
                  >编辑</el-button
                >
                <el-button
                  size="mini"
                  type="danger"
                  @click="removeParams(scope.row.attr_id)"
                  >删除</el-button
                >
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!-- 添加参数的对话框 -->
    <el-dialog
      :title="'添加' + titleText"
      :visible.sync="addDialogVisible"
      width="50%"
      @close="addDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form
        :model="addForm"
        :rules="addFormRules"
        ref="addFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 修改参数的对话框 -->
    <el-dialog
      :title="'修改' + titleText"
      :visible.sync="editDialogVisible"
      width="50%"
      @close="editDialogClosed"
    >
      <!-- 添加参数的表单 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
      >
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  export default {
    data() {
      return {
        // 商品分类列表
        cateList: [],
        // 级联选择框的配置对象
        cateProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children',
        },
        // 数据双向绑定的数组
        selectedCatKeys: [],
        // 默认显示的tabs模块
        activeName: 'many',
        // 动态参数的数据
        manyTableData: [],
        // 静态属性的数据
        onlyTableData: [],
        // 控制添加对话框的显示与隐藏
        addDialogVisible: false,
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 添加参数的表单数据对象
        addForm: {
          attr_name: '',
        },
        // 编辑参数的表单数据对象
        editForm: {},
        // 添加参数的表单验证规则
        addFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' },
          ],
        },
        // 修改参数的表单验证规则
        editFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' },
          ],
        },
      }
    },
    created() {
      this.getCateList()
    },
    methods: {
      // 获取所有的商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败')
        }
        this.cateList = res.data
        console.log(this.cateList)
      },
      // 级联选择框选中 会变化 触发这个函数
      handleChange() {
        this.getParamsData()
      },
      // tabs点击事件的处理函数
      handleClick() {
        this.getParamsData()
        console.log(this.activeName)
      },
      // 获取参数的列表数据
      async getParamsData() {
        // 证明选中的不是三级分类
        if (this.selectedCatKeys.length !== 3) {
          this.selectedCatKeys = []
          this.manyTableData = []
          this.onlyTableData = []
          return
        }
        // 证明选中的是三级分类
        console.log(this.selectedCatKeys)
        // 根据所选分类的id,和当前所处的面板,获取对应的参数
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: {
              sel: this.activeName,
            },
          }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败')
        }

        // 在赋值之前,将data进行循环,分割之后得到数组
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          // 文本框输入的值
          item.inputValue = ''
        })

        console.log(res.data)

        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      // 监听添加参数对话框的关闭清除事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 监听编辑参数对话框的关闭清除事件
      editDialogClosed() {
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮,添加参数
      addParams() {
        // 预验证
        this.$refs.addFormRef.validate(async (valid) => {
          if (!valid) return
          // 获取数据
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName,
            }
          )
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          }
          this.$message.success('添加参数成功')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮展示修改对话框
      async showEditDialog(attr_id) {
        // 查询当前参数的信息
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes/${attr_id}`,
          {
            params: { attr_sel: this.activeName },
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败')
        }
        this.editForm = res.data
        console.log(this.editForm)
        this.editDialogVisible = true
      },
      //  点击修改参数,修改信息
      editParams() {
        this.$refs.editFormRef.validate(async (valid) => {
          if (!valid) return
          const {
            data: res,
          } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
          )
          if (res.meta.status !== 200) {
            return this.$message.error('修改参数信息失败')
          }
          this.$message.success('修改信息成功')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      // 根据id删除对应的参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm(
          '此操作将永久删除该文件, 是否继续?',
          '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning',
          }
        ).catch((err) => err)
        // 用户取消了删除操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('取消了删除')
        }
        // 删除的逻辑
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attr_id}`
        )
        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败')
        }
        this.$message.success('删除参数成功')
        this.getParamsData()
      },
      // 文本框按下enter键 或 失去焦点 打印ok
      async handleInputConfirm(row) {
        console.log('ok')
        // row.inputVisible = false
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        // 如果没有return,则证明输入的内容需要做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 需要发起请求保存这次操作
        this.saveAttrVals(row)
      },
      // 将对saveAttrVals的操作,保存到数据库
      async saveAttrVals(row) {
        const { data: res } = await this.$http.put(
          `categories/${this.cateId}/attributes/${row.attr_id}`,
          {
            attr_name: row.attr_name,
            attr_sel: row.attr_sel,
            attr_vals: row.attr_vals.join(' '),
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改参数成功')
      },

      // 点击按钮显示输入框
      showInput(row) {
        row.inputVisible = true
        // 让文本自动获取焦点
        // $nextTick方法的作用是,当页面上的元素被重新渲染之后,
        // 才会指定回调函数中的代码
        this.$nextTick((_) => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      },
      // 删除对应的参数可选项
      handleClose(i, row) {
        row.attr_vals.splice(i,1)
        this.saveAttrVals(row)
      },
    },
    computed: {
      // 如果按钮需要被禁用,则返回true,否则,返回false
      isBtnDisabled() {
        if (this.selectedCatKeys.length !== 3) {
          return true
        }
        return false
      },
      // 当前选中的三级分类的id
      cateId() {
        if (this.selectedCatKeys.length === 3) {
          return this.selectedCatKeys[2]
        }
        return null
      },
      // 动态计算对话框的标题
      titleText() {
        if (this.activeName === 'many') {
          return '动态参数'
        }
        return '静态属性'
      },
    },
  }
</script>

<style lang="less" scoped>
  .el-alert {
    margin-right: 30px;
  }
  .cat_opt {
    margin: 15px 0;
  }
  .el-cascader {
    margin-left: 5px;
  }
  .el-tag {
    margin: 10px;
  }
  .input-new-tag {
    width: 120px;
  }
</style>